tests(here-doc): ensure here docs work in many situations

test.sh

@@ -1473,4 +1473,90 @@ minishell: $VAR: ambiguous redirect
 minishell: $VAR: ambiguous redirect
 EOF
 
+when_run <<"EOF" "here-documents limiter is not expanded"
+export LIM=hello
+cat << $LIM
+hi
+hello
+goodbye
+$LIM
+<< $LIM
+EOF
+expecting <<"EOF"
+hi
+hello
+goodbye
+minishell: warning: here-document delimited by end-of-file (wanted `$LIM')
+EOF
+
+when_run <<EOF "heredoc does not execute commands"
+cat << eof > bonjour
+echo hello
+cat bonjour
+EOF
+expecting <<"EOF"
+minishell: warning: here-document delimited by end-of-file (wanted `eof')
+EOF
+
+when_run <<EOF "heredoc into another file"
+cat << eof > bonjour
+hello
+there
+eof
+cat bonjour
+EOF
+expecting <<"EOF"
+hello
+there
+EOF
+
+when_run <<EOF "heredoc into another command"
+cat << eof | rev
+hello
+there
+eof
+EOF
+expecting <<"EOF"
+olleh
+ereht
+EOF
+
+when_run <<EOF "heredoc all alone"
+<< eof
+it's just me
+by myself
+i'm all alone ;.;
+eof
+EOF
+expecting <<"EOF"
+EOF
+
+when_run <<EOF "TRIPLE SUMMON"
+cat<<x<<y<<z
+hello
+x
+there
+y
+hi
+z
+EOF
+expecting <<EOF
+hi
+EOF
+
+when_run <<EOF "TRIPLE SUMMON into unknown command"
+qwertyuiop<<x<<y<<z
+hello
+x
+there
+y
+hi
+z
+echo \$?
+EOF
+expecting <<EOF
+minishell: qwertyuiop: command not found
+127
+EOF
+
 finalize